本文共 3946 字，大约阅读时间需要 13 分钟。

下来我们一个一个介绍build文件夹下面的一些配置

check-versions.js

'use strict'const chalk = require('chalk') //输入终端的一些样式，红色或者绿色，可以通过这个模块来定义const semver = require('semver') // 处理版本号const packageConfig = require('../package.json')const shell = require('shelljs') //可以执行终端的命令function exec (cmd) {  return require('child_process').execSync(cmd).toString().trim()}// 此处定义node版本的一些要求const versionRequirements = [  {    name: 'node',    currentVersion: semver.clean(process.version), //当前node的版本    versionRequirement: packageConfig.engines.node //规定版本的要求  }]// 假如命令中有npm，那么把npm的版本要求也加入到里面if (shell.which('npm')) {  versionRequirements.push({    name: 'npm',    currentVersion: exec('npm --version'),  //执行exec拿到当前npm的版本    versionRequirement: packageConfig.engines.npm //拿到npm的版本要求  })}module.exports = function () {  const warnings = []  // 遍历versionRequirements这个数据  for (let i = 0; i < versionRequirements.length; i++) {    const mod = versionRequirements[i]    // 查看当前的版本是否在要求的版本之内    if (!semver.satisfies(mod.currentVersion, mod.versionRequirement)) {      // 如果不在的话就push一些警告信息      warnings.push(mod.name + ': ' +        chalk.red(mod.currentVersion) + ' should be ' +        chalk.green(mod.versionRequirement)      )    }  }  // 假如有错误信息，则在终端打印一些信息  if (warnings.length) {    console.log('')    console.log(chalk.yellow('To use this template, you must update following to modules:'))    console.log()    for (let i = 0; i < warnings.length; i++) {      const warning = warnings[i]      console.log('  ' + warning)    }    console.log()    // 最终退出程序    process.exit(1)  }}

webpack.base.conf.js

'use strict'const path = require('path')const utils = require('./utils')const config = require('../config')const vueLoaderConfig = require('./vue-loader.conf')// 此函数做路径的拼接function resolve (dir) {  return path.join(__dirname, '..', dir)}const createLintingRule = () => ({  test: /\.(js|vue)$/,  loader: 'eslint-loader',  enforce: 'pre',  include: [resolve('src'), resolve('test')],  options: {    formatter: require('eslint-friendly-formatter'),    emitWarning: !config.dev.showEslintErrorsInOverlay  }})module.exports = {  context: path.resolve(__dirname, '../'),  // 入口  entry: {    app: './src/main.js'  },  output: {    path: config.build.assetsRoot,    filename: '[name].js',    // 访问资源的时候从根目录去访问    publicPath: process.env.NODE_ENV === 'production'      ? config.build.assetsPublicPath      : config.dev.assetsPublicPath  },  // 引进来一些模块的时候的配置  resolve: {    // 文件的后缀名    extensions: ['.js', '.vue', '.json'],    // 别名    alias: {      'vue$': 'vue/dist/vue.esm.js',      '@': resolve('src'),    }  },  module: {    rules: [      ...(config.dev.useEslint ? [createLintingRule()] : []),      {        test: /\.vue$/,        loader: 'vue-loader',        options: vueLoaderConfig      },      {        test: /\.js$/,        loader: 'babel-loader',        include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]      },      {        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,        loader: 'url-loader',        options: {          limit: 10000,          name: utils.assetsPath('img/[name].[hash:7].[ext]')        }      },      {        test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,        loader: 'url-loader',        options: {          limit: 10000,          name: utils.assetsPath('media/[name].[hash:7].[ext]')        }      },      {        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,        loader: 'url-loader',        options: {          limit: 10000,          name: utils.assetsPath('fonts/[name].[hash:7].[ext]')        }      }    ]  },  node: {    // prevent webpack from injecting useless setImmediate polyfill because Vue    // source contains it (although only uses it if it's native).    setImmediate: false,    // prevent webpack from injecting mocks to Node native modules    // that does not make sense for the client    dgram: 'empty',    fs: 'empty',    net: 'empty',    tls: 'empty',    child_process: 'empty'  }}